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Geologled-r anus 14C Page 4 <br /> Site Conceptual Model Report(2006 Revision) <br /> Valentine(Castle Motors) <br /> Project No 723 2 <br /> June 16,2006 <br /> 2.2 Site Investigation <br /> ' As outlined above in Section 10, the site investigation has consisted of multiple soil borings, <br /> the installation of monitoring wells, and receptor well surveys These efforts generated a <br /> significant amount of data that will be summarized in the following sections <br /> ' 2.2.1 Soil <br /> Soil samples were collected from both the vadose and saturated zones The data were used to <br /> ' estimate the lateral and vertical extent of the contamination in the two media Specific <br /> analyses that have been utilized in the investigation (excluding waste oil tank removal) <br /> include <br /> i . Gasoline range petroleum hydrocarbons (TPH-G) by EPA method 5030/8015(m) or <br /> 8020 <br /> • Benzene, Toluene, Ethylbenzene and Xylene (BTEX) by EPA method 8020 <br /> • Gasoline oxygenates MTBE, DIPE, ETRE, TAME and TBA by EPA method 8260 <br /> The soil laboratory data generated during the investigation are summarized in Tables 1 and 2 <br /> in Appendix B Figure 2 contains the locations of the boreholes advanced in the current <br /> investigation Appendix C includes the borehole logs generated in the site investigation <br /> The February 2006 CPT boring's groundwater and soil data are included in Table 2 in <br /> Appendix B <br /> 2.2.2 Groundwater <br /> Wm J Hunter & Associates commenced groundwater monitoring in March 1995 and <br /> intermittent monitoring (2 - 3 times per year) continued through 2001 Quarterly monitoring <br /> ' has been consistently performed from February 2002 and continues to the present The <br /> majority of the groundwater analyses were performed for gasoline range petroleum <br /> hydrocarbons because the former USTs contained gasoline fuel Specific analyses that have <br /> been utilized in the investigation include <br /> 0 Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 5030/8015(M) <br /> 0 Benzene, Toluene, Ethyl Benzene and Xylene (BTEX)by EPA method 602 <br /> • Oxygenated Fuel Compounds (MTBE, DIPE, ETBE, TAME & TBA)by EPA method <br /> 8250 <br /> ' • 1,2 DCA & EDB by EPA method 8260 <br /> • Methanol &Ethanol by GC-FID <br /> • Purgeable halocarbons by EPA method 601 (well MW-1 sampled on 10/3/94) <br /> The above analyses were conducted primarily to define the nature and extent of the <br /> contamination <br /> ' The groundwater analytical data compiled by Wm J Hunter & Associates (WJH) and GTI are <br /> included in Tables 3, 4, 5 in Appendix B, respectively <br /> 1 <br />